package com.wj.advice;

import com.wj.annotation.IgnoreResponseAdvice;
import com.wj.vo.CommonResponse;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import java.util.Objects;

/**
 * 实现统一响应
 */
@RestControllerAdvice(value = "com.wj")
public class CommonResponseDataAdvice implements ResponseBodyAdvice<Object> {

    /**
     * 判断是否需要对响应进行处理
     *
     * @param methodParameter
     * @param aClass
     * @return
     */
    @Override
    public boolean supports(MethodParameter methodParameter, Class<? extends HttpMessageConverter<?>> aClass) {
        if (methodParameter.getDeclaringClass().isAnnotationPresent(IgnoreResponseAdvice.class)) return false;
        if (Objects.requireNonNull(methodParameter.getMethod()).isAnnotationPresent(IgnoreResponseAdvice.class)) return false;
        return true;
    }

    /**
     * 响应给客户端前需要进行的处理
     *
     * @param o
     * @param methodParameter
     * @param mediaType
     * @param aClass
     * @param serverHttpRequest
     * @param serverHttpResponse
     * @return
     */
    @Override
    public Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType, Class<? extends HttpMessageConverter<?>> aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {
        CommonResponse<Object> response = new CommonResponse<>(0,"");
         if (Objects.isNull(o)) return response;
         if (o instanceof CommonResponse) {
             response = (CommonResponse<Object>) o;
         }else {
             response.setData(o);
         }
        return response;
    }
}
